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<p>[QUOTE=&quot;johnmilton, post: 8588540, member: 101855&quot;]Coin doctors tone coins with chemicals, like sulfur. It happens very quickly. The trouble is it usually does not look natural to the experienced eye, and sometimes it keeps going. </p><p><br /></p><p>One old fashioned way is to store the coin in an envelope that is made of paper that is not sulfur free. High quality coin envelopes are made with sulfur free paper. This can work well, but it ofter takes years.[/QUOTE]</p><p><br /></p>

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